J Syst Evol ›› 1990, Vol. 28 ›› Issue (3): 177-184.
• Research Articles •
Yan Yi-Xiang, Huang Rui-Fu, Wei Rong-Cheng, Xu Jie-Mei
The karyotypes of 5 samples in Allium Sect. Bromatorrhiza Ekberg were
analysed in this paper.
In Allium wallichii Kunth, the first sample is a diploid, with genome formula is AA and
karyotype formula is K(2n)=2x=14=2m(SAT)+2m+10sm. The second is an autotetraploid,
with genome formula AAAA, karyotype formul K(2n)=4x=28=2m(SAT)+6m+20sm. These
two karyotypes belong to “3A”. The two karyotypes of A. wallichii Kunth are similar in
morphology, though different in ploidy.
In Allium hookeri Thwaites, the first sample is a dibasic autoallotriploid. Its genome
formula is AAB1; the basic number of the genome A is 7 and that of the genome B1 is 8. The
karyotype formula is K(2n)=2x+x'=22=(12sm+2t)+(1m+4sm+1st+2t). The second is
also an autoallotriploid. The genomes in pairs are similar to those in the first sample in size
and morphology of chromosomes. However, the unpaired genome differs from the first one
apparently. Therefore, its genome formula is AAB2, and karyotype formula is K(2n)=2x+
x'=22=(12sm+2t)+(3m+1sm+2st+2t). The third is doubling of the first karyotype. It is
an autoallohexaploid, with genome formula AAAAB1 B1 and karyotype formula K(2n)=4x+2x'= 44= (24sm+4t) + (2m+8sm+2st+4t). These three karyotypes belong to “3A”.
Allium wallichii Kunth,
Allium hookeri Thwaites,
Yan Yi-Xiang, Huang Rui-Fu, Wei Rong-Cheng, Xu Jie-Mei. Studies on the Karyotype of 5 Samples of Allium Sect. Bromatorrhiza Ekberg[J]. J Syst Evol, 1990, 28(3): 177-184.
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